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Does the fuel pump relay also energize the pre pump? as well as the main? 900 1991

posted by  poonjab on  Thu May 9 07:51 CST 2013
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last visit: Thu Apr 10 10:28 CST 2014
[RELATED]

I have a 1991 940 se turbo and so far in the last 200 miles it has failed to start. Both times it is when I have only driven the car for .5 miles and then no restart. I can tell it is the pre pump because both times I never heard it energize up while key is in position 2. Then after 5 minutes I can hear it buzz up and then the car starts. So Is it just the pre-pump that needs replaced or does a failing relay also cause this tx.

ps I did the tube from the gas fill to my ear test while running and the sound is a nice constant whirl.

Paul






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